staging: dwc2: move function to more logical place

The function dwc2_get_hwparams() was in an awkward place, mixed
in with the dwc2_set_param* functions. Move it down after those
functions.

Signed-off-by: Paul Zimmerman <paulz@synopsys.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>